I did put the shim back on, i just removed it to see if there is any difference.
I do have air leaks...when i finish my runs there is dust+fuel on the neck and screws of the carb and there is some under the cooling head.
I removed everything last night and used PTFE to seal them and silicone on the neck,head and pull start plate.
I didn't do this sooner because i thought that there wasn't much of a leak to increase the temps at ~280 and not let the engine run any richer,i thought the problem was somewhere else.
Did anyone noticed any difference in temps and tuning after sealing everything and how much?
Also, when i removed the pull starter and tried to put it back,the only way to fit it was to let some rope out about 1.5inches.To fix this i have to cut the rope and tie it up again closer to the plate,BUT i can't remove that steel cylinder on the handle of the pull starter that the rope pass around it.How can i pass it through there and tie it up?